Broad-Spectrum Inhibitors against Class A, B, and C Type β-Lactamases to Block the Hydrolysis against Antibiotics: Kinetics and Structural Characterization.
Nabeela Farhat, Divya Gupta, Abid Ali, Yogesh Kumar, Farheen Akhtar, Senthilguru Kulanthaivel, Prashant Mishra, Feroz Khan, Asad U Khan
Author Information
Nabeela Farhat: Medical Microbiology and Molecular Biology Lab, Interdisciplinary Biotechnology Unit, Aligarh Muslim Universitygrid.411340.3, Aligarh, Uttar Pradesh, India.
Divya Gupta: Medical Microbiology and Molecular Biology Lab, Interdisciplinary Biotechnology Unit, Aligarh Muslim Universitygrid.411340.3, Aligarh, Uttar Pradesh, India.
Abid Ali: Medical Microbiology and Molecular Biology Lab, Interdisciplinary Biotechnology Unit, Aligarh Muslim Universitygrid.411340.3, Aligarh, Uttar Pradesh, India.
Yogesh Kumar: CSIR-Central Institute of Medicinal & Aromatic Plants, CIMAP, Lucknow, Uttar Pradesh, India.
Farheen Akhtar: Medical Microbiology and Molecular Biology Lab, Interdisciplinary Biotechnology Unit, Aligarh Muslim Universitygrid.411340.3, Aligarh, Uttar Pradesh, India.
Senthilguru Kulanthaivel: Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology, New Delhi, Delhi, India.
Prashant Mishra: Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology, New Delhi, Delhi, India.
Feroz Khan: CSIR-Central Institute of Medicinal & Aromatic Plants, CIMAP, Lucknow, Uttar Pradesh, India.
Asad U Khan: Medical Microbiology and Molecular Biology Lab, Interdisciplinary Biotechnology Unit, Aligarh Muslim Universitygrid.411340.3, Aligarh, Uttar Pradesh, India. ORCID
The emergence of antibiotic resistance has led to a global crisis for the physician to handle infection control issues. All antibiotics, including colistin, have lost efficiency against emerging drug-resistant bacterial strains due to the production of metallo-β-lactamases (MBLs) and serine-β-lactamases (SBLs). Therefore, it is of the utmost importance to design inhibitors against these enzymes to block the hydrolytic action against antibiotics being used. Although various novel β-lactamase inhibitors are being authorized or are under clinical studies, the coverage of their activity spectrum does not include MDR organisms expressing multiple classes of β-lactamases at a single time. This study reports three novel broad-spectrum inhibitors effective against both SBLs and MBLs. Virtual screening, molecular docking, molecular dynamics simulations, and an pharmacokinetic study were performed to identify the lead molecules with broad-spectrum ability to inhibit the hydrolysis of β-lactam. The selected compounds were further assessed by cell assays (MIC, 50% inhibitory concentration [IC], kinetics, and fluorescence against class A, B, and C type β-lactamases) to confirm their efficacies. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay was performed to check the toxicity of screened lead molecules. All three selected inhibitors were found to reduce MIC and showed good affinity against all the SBLs and MBLs produced by class A, B, and C type β-lactamases. These nontoxic novel non-β-lactam broad-spectrum inhibitors bind to the active site residues of selected β-lactamases, which are crucial for β-lactam antibiotic hydrolysis. These inhibitors may be proposed as a future drug candidate in combination with antibiotics as a single formulation to control infection caused by resistant strains. Hence, this study plays a significant role in the cure of infections caused by antibiotic-resistant bacteria. Several inhibitors for usage in conjunction with antibiotics have been developed. However, to date, there is no commercially available broad-spectrum β-lactamase inhibitor that targets both MBLs and SBLs. Here, we showed three novel broad-spectrum inhibitors with promising results through computational techniques and studies. These inhibitors are effective against both SBLs and MBLs and hence could be used as future drug candidates to treat infections caused by multidrug-resistant bacteria producing both types of enzymes (SBLs and MBLs).
